Records that have not been sealed in the case show Sue Ann Hamm's attorneys have asked Continental Resources to produce documents, along with documents from several private companies in which Hamm has an ownership stake.

Sue Ann Hamm is a former Continental employee but no longer works at the company. Her employment dates were not immediately available Thursday.

It's not the first time the Hamms have gone to divorce court. Harold Hamm filed for divorce in Garfield County in 1998, citing “irreconcilable incompatibility” and asked the court to grant him custody of the couple's daughters, Jane, now 22, and Hilary, now 19. That divorce petition was withdrawn about a month later.

Sue Ann Hamm filed for divorce in October 2005 in Oklahoma County. That case was withdrawn in December 2005.

Harold Hamm has three children from his first marriage, which ended in divorce in 1987.

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Paul Monies is an energy reporter for The Oklahoman. He has worked at newspapers in Texas and Missouri and most recently was a data journalist for USA Today in the Washington D.C. area. Monies also spent nine years as a business reporter and...